You’ll of course need to replace my values with yours, but otherwise that’s really all there is to it. Once you’re done with the above two steps then you can happily navigate to wp-content/themes/theme-slug and get to work.

The added benefit of this approach is all the additional goodies that come with WP-CLI. If you’re a theme builder, study the theme list and integrate it into your workflow. It’ll make common actions like switching themes and checking theme paths feel so much quicker.